It was an interesting engineering challenge to ensure that hundreds of vector-based emoji with smooth animations could simultaneously play on the screen of any mobile phone. Telegram is the first company ever to have implemented this in a mobile app. Adding custom emoji to the text of any message is just the first step of the upcoming visual revolution on Telegram. In a few weeks, users will be able to add any custom emoji as a reaction to a message and display an emoji as their current status next to their name. All of this will become available to Premium subscribers first, because they are the ones who make it possible for Telegram to stay free and private for everyone.